Tread surface and periphery of a footwear unit sole



FIG. 1 is a bottom plan view of a tread surface and periphery of a footwear unit sole showing our new design it being understood that the indentation pattern is continuous over the areas bordered by dot-dash lines;

FIG. 2 is a right side elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a front edge elevational view;

FIG. 5 is a rear edge elevational view;

FIG. 6 is an enlarged plan view of a portion of the tread surface showing the rhombus-shaped indentations; and,

FIG. 7 is a further enlarged fragmentary cross-sectional view taken on line 7--7 of FIG. 6. 

The ornamental design for a tread surface and periphery of a footwear unit sole, as shown and described. 